When two or more people buy a property together and contribute unequal amounts -- or simply want clarity about who owns what share -- a declaration of trust is the legal document that records those beneficial ownership shares in writing. Without one, disputes about who is entitled to what on sale, separation or death can be costly and uncertain. This guide explains when you need a declaration of trust, what it should cover, and how it relates to tax reporting in 2026/27.
What a Declaration of Trust Is
A declaration of trust (sometimes called a deed of trust) is a legally binding document that sets out the beneficial ownership of a property -- who is entitled to what share of its value -- separately from the legal title registered at the Land Registry. Legal title can only show up to four names and does not by itself record percentage shares, so a declaration of trust fills that gap.
It is most relevant when property is held as tenants in common (each owner has a distinct, defined share) rather than as joint tenants (where owners hold the whole property together equally, with automatic survivorship).
When You Need One
A declaration of trust is particularly valuable when:
Co-owners contribute unequal amounts to the deposit or ongoing mortgage payments.
Unmarried couples buy together, since they lack the automatic financial remedies available to married couples or civil partners on separation.
Parents contribute to a child's deposit but are not on the mortgage or legal title.
Friends or family buy an investment or buy-to-let property together in unequal shares.
Co-owners want to record what happens to their share if one person wants to sell, dies, or the relationship ends.
What It Typically Covers
A well-drafted declaration of trust usually sets out:
Each owner's percentage share of the beneficial (financial) interest in the property.
How the deposit and mortgage payments were, or will be, funded.
How sale proceeds should be divided, including how any mortgage and costs are deducted first.
What happens if one owner wants to sell and the other does not, or cannot afford to buy them out.
How ongoing costs, such as maintenance and insurance, are shared.
It is typically prepared as a formal deed alongside the conveyancing process, often alongside a separate cohabitation agreement for unmarried couples covering wider financial matters beyond the property itself.
Tax Implications and Form 17
For married couples and civil partners, rental income from a jointly owned property is normally split 50:50 for tax purposes by default, regardless of actual ownership shares, unless a Form 17 election is made to HMRC to declare income in line with a different beneficial ownership split recorded in a declaration of trust.
This makes a declaration of trust particularly useful for married couples wanting to allocate rental income more towards the lower or non-taxpaying spouse -- but Form 17 only works if the underlying beneficial ownership genuinely is unequal (as evidenced by the declaration of trust); you cannot simply elect an income split that does not reflect real ownership shares.
Frequently Asked Questions
What is the difference between a declaration of trust and joint tenancy?
Joint tenants own the whole property together equally with a right of survivorship (on death, the share passes automatically to the surviving owner), and there are no separately defined percentage shares. A declaration of trust is used with tenants in common, where each owner holds a specific, defined share that can be unequal, passed on by will, and recorded precisely in writing.
Do unmarried couples need a declaration of trust when buying a house together?
It is strongly advisable, especially where contributions are unequal. Unmarried couples do not have the same automatic legal claims to each other’s property on separation that married couples or civil partners have, so a declaration of trust is often the clearest way to protect each person’s financial contribution and avoid disputes later.
How much does a declaration of trust cost?
Costs vary by solicitor and complexity, but a straightforward declaration of trust prepared alongside a property purchase is typically a modest fixed fee compared with overall conveyancing costs. More complex arrangements, or ones prepared separately from a purchase, may cost more due to additional drafting and advice time.
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Can a declaration of trust be changed later?
Yes, co-owners can agree to vary the shares recorded in a declaration of trust, for example if one person pays down more of the mortgage over time, but this should be done formally with a new or amended deed, ideally with legal advice, rather than an informal verbal agreement, to keep it enforceable.
Does a declaration of trust affect Stamp Duty Land Tax?
The SDLT due on the original purchase is based on the price paid and how the purchase is structured at the time, not directly by a later declaration of trust. However, transfers of beneficial interest recorded in or arising from a declaration of trust (for example, if one party takes on more of an existing mortgage) can themselves have SDLT consequences in some circumstances, so it is worth checking with a conveyancer.
What is Form 17 and how does it relate to a declaration of trust?
Form 17 is the HMRC election married couples and civil partners use to have jointly owned property income taxed according to actual unequal beneficial ownership shares, rather than the default 50:50 split. It can only be used where a genuine unequal split exists, and a declaration of trust is the standard evidence used to prove that split to HMRC.
Is a declaration of trust the same as a will?
No. A declaration of trust records who owns what share of a property during the owners’ lifetimes and how proceeds should be split on sale; it does not by itself determine who inherits a share on death (though tenants-in-common shares can be left by will, unlike joint tenancy shares, which pass automatically to the survivor).
Can a declaration of trust protect money a parent gives towards a deposit?
Yes, this is a common use. If a parent contributes to a child’s deposit but is not on the mortgage or wants the contribution recorded as a loan or a defined percentage share rather than an outright gift, a declaration of trust (sometimes combined with a separate loan agreement) can formally document that arrangement and protect the parent’s interest.
What happens if co-owners never sign a declaration of trust and later disagree?
Without a declaration of trust, disputes about beneficial ownership shares generally have to be resolved by looking at all the surrounding evidence -- financial contributions, conversations, conduct -- often through the courts, which can be slow, stressful and expensive compared with having clear written terms agreed from the outset.
Do you need a solicitor to draft a declaration of trust?
It is not a strict legal requirement, but it is strongly recommended. A solicitor or conveyancer can make sure the document is correctly executed as a deed, reflects everyone’s intentions clearly, and stands up to scrutiny if there is ever a dispute or an HMRC query about a Form 17 election.
Disclaimer: This guide provides general information about declarations of trust for co-owned property in 2026/27 and is not a substitute for advice from a solicitor or conveyancer, who should prepare the document to reflect your specific circumstances. This guide is for general information only and is not professional advice. Consult a qualified adviser and refer to gov.uk for current official guidance before relying on any treatment.
